Getting error in plugin add page

how to fix getting error in wordpress plugin page Warning: Undefined property: stdClass::$plugin in /home/badshaht/domainurl/wp-includes/class-wp-list-util.php on line 167

167 code below

$this->output as $key => $value ) { if ( is_object( $value ) ) {$newlist[ $key ] = $value->$field; } elseif ( is_array( $value ) ) { $newlist[ $key ] = $value[ $field ]; } else {